Tube



FIG. 1 is a front perspective view of the tube showing my new design;

FIG. 2 is a bottom view thereof;

FIG. 3 is a side view thereof, the other side view being a mirror image;

FIG. 4 is a front view thereof; and,

FIG. 5 is a top view. 

The ornamental design for a tube, as shown and described. 